Dash-pot.



` H. W. CHENEY.

l DASH POT.

APPLICATION ILED MAY 13, 1009. im; 3,3?. Y Patented Mar. 2, 1915.

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o A 22 'd H 'g 22 7 /5 /D minimum l l u Mmmm mmm" 1 E 5a t Cli ENRBERTi3/v. CHENEY, OF MILWAUKEE, WISCONSIN, ASSIGNO MANUFACTURING- CO MENTS,T0 ALLIS-QHALIVIERS EELAEVARE,

DASH-POT.

Specification of Letters Patent,

Application filled May 13, 1909. Serial/110495756.

To all.' 'ie/"rom it may conce/riz e it known that l, l'lniinnn'r lV.CHENEY, a citizen of the linitcd ,tiites, residing at Iililwaiiliec, inthe county ot iililwaukee and tr'tate el lViscoiisin, haie inyentcdcertain new and useful improvements in Dashlots, ot which the followingis a full, clear, and exact specilication. y

'l`his invention relates to improvements in rotary dash-igiots,i and has'for its niaiu Object to improve the construction and elliciency ot'such devices.

More speciiically the invention aims to provide an improved forni ot'rotary dashpot which permits a retarded or slow' movement in onedirect-ion, and a very quick return or rapid movement in the oppositedirection.. t

A still further object is to do away with the necessity for the stallingbox, and at the same time to provide a construction wherein leakage ofthe cushioning. fluid, which is preferably a mixture of glycerin andalcohol, from the casing or cylinder is prevented, and wherein thecompartment or chamber in which the cushioning takes place will at alltimes be completelyv lilled with the cushioning iliiid.

A still further object is to provide a construction which permits theparts to be readily assen i or taken apartiii'id has means i'or casillaand accurately adjusting the' ietai'ding action.

The invention may be briefly summarized as consisting in certain noieldetails of construction and combinations and arrangements O1 parts whichwill be described in .the specification and set forth in the appendedclaims.

Reference is had to the accompanying sheet of drawings, in which*-Figure 1 is a perspective view of a dashpot constructedin accordancewith my invention, parts being broken away for the salie ot cleariiess;Fig. 2 is a vertical sectional view Oi the same; `Fig. 3 is a transversesectional 'View taken substantially along the line i5-Set Fig. 2 lookingin the direction indicated by the arrows, the movable vane beingapproximately at one of its extreme positions; Fig. 4 is a similar viewsubstantially along the line 4 4 of Fig. 2, looking in the directionindicated by the arrow, the movable vane being substantiallyfinits-Other extreme position, which,

R, :BY MESNE ASSIGN- iiirANY, A CORPORATION or Patented Mair. 2, 19t-5.

in this case is 18004 from the position shown in Fig. 3; and Fig. 5

` is a fragmentary sectional view talren through par t ol a stationarypartition employed in the dash-pot,

substantially along the line 5-5 or' Fig.

Referring now to the ligures oi the drawing. 10 represents a casev metalcasing which is provided with bottoni 1l having a downwardly centrallylocated boss 12, and

cylinder or an integral projecting with a removable cover 13 having athreaded fiange 1lwhich is designed top of the cylinder. ed to besupported' and for this purpose is provide side with an integral lug l5adapted to-beL secured by suitable screws or lent` to any desiredsupport.

to be screwed into the The cylinder is adaptiii a vertical position,y

d along the the equiva- Thc cylinported a transverse partition in a diskthe form of 17 which divides the interior of the cylinder into twocoiiipartinents, an upper compartment A and a lower l. The cover 13 isprovided compartment with adowuwardly projecting central tubular flange18 which extends entirely through the coinpai'tiiieiit and is providedat its lowcreiid with a reduced portion 19 which engages with a closeAfit in a centrally lo lar opening in the center' o' the cated circudisk17.

At 2() shown the vertical operating shalt ofthe dash-pot, through andhaving a lar flange within a said shaft extending bearing in the tilbu-18, and at its lower end engaging centering opening or socket 21 whichextends from the bottom ot the chamber i into a. boss 12 extendingdownward Ylroiii the bottoni 11, shaft projects a short distance rover13 and may be connected in any suit-y able maiiiier to any desired mecling either a rotary or nient` The upper end of the beyond the ianisin havi'eciprocating movebutin the present case the end of the shaft hassecured thereto a pinion 22 which is engaged by a rack Q3.

As will be apparent, the com pertinent B serves as the cushioning orretarding chainlier, and the chamber A serves principally as an overliowchamber or as the head or excess cushioning will partially lillcompartment completely lill compartment B. tion is provided with anopening a receptacle for fluid which A and will The parti- 17 throughi(lill) which the )fluid may pass from dne compartment to another.Locatediiii the compartment B and extending bet'ii'lte'n the inner jeriphery oit the cylinder Aland the shaft is a stationary partition orbarrier 2i, the vertical edges of which engage with a close ht the shaftand the inner wallet the cylinder, and the upper and lower edges ofwhich engage respectively the lower` face of the dish l? and the inneror upper tace of the bottom il so that a leakage ot duid 'around theedges ot this partition cannot take place. '.l` he parti* tion ispreferably yheld in position by a screw 25 passing through the disk. 17and the upper part of the partition, and by a dowel. pin 26 extendingthrough the lower part of the partition and into the bottom l1. ll1 hisparu tition is provided with a rectangular valve opening 27 ofconsiderable area, and with a movable valve member 27a of the swingingor hinged type, designed to be swung against the face of the partitionwhen the shaft 1s rotated in one direction so as to prevent the passageof the cushioning fluid through the valve opening and to swing away fromthe partition when opposite direction to permit the free passage of thefluid through the valve opening. ln the present case this valve memberis supiported by a vertical pin 28 passing through lugs on the side ofthe partition L24 near the shaft and is normally held against the faceot' the partition so as to close the valve opening by a coil spring 29.rl`he partition is lalso provided with a small transverse opening,r 30through which the cushioning fluid is allowed to pass slowly from oneside of thev partition to the other to obtain the slow or retardedmovement et the shaft in one direction. rl`his transverse opening 30intersects the vertical opening or socket which is occupied by the screw25, and the latter is provided also with a transverse opening 3l, which,whenthe screw is properly located is in aline-ment with the opening 30.'it will be seen that by turning,` ,the screw 25 slightly, theved'ectivearea of this opening 30 through the radial partition, and consequentlythe rate at which the cushioning fluid passes through the opening can bevaried. rl`he screw 25 is preferably provided with un integral. head atits lower end, and at its upper end, which is slotted Jfor an sdjustingtool, is provided with a locknut 25, which, when the screw is turned toany position may be tightened to securely lock the screw in thatposition. Secured to the shaft by pins or, screws 32 is a vane 33 whichis of substantially the same size as the partition 2d, and engages, withclose lit the inner cylindrical surface andbottom of the cylinder andthe disk 17 so that leakage of the cushioningfluid about the edges ofthe vane cannot take place to any considerable extent.

The fluid, in this case a liquid, which as the shaft is rotated in the'-be'torc stated, is preterably a mixture ot glycerin and alcohol, willfill completely con'ipa tn'ient B and will extend to a certain heir/:htin compartment A. lt is to be noted that no stull'ing box is prosf'idedfor the shalt, and to avoid leakage of the liquid through the cover i3about the shaft, the latter is provided with an annular groove whichwill be above the surface of the liquid in compartment A, and thetubular flange lli is provided with a transverse opening 3G whichcomnmnicates with the annular groove 'll`hus if any oi the liquid passesfrom cham- .ber ll upwardlvalong the shaft between the latter and thetubular flange, it will enter the annular groove and pass through theopening 3G into compartment A. Any liquid which passes upwardly in thismanner from compartment B will be replaced by liquid which passesdownwardly through the opening lia in the disk.

lVith this construction, when the shaft is rotate'd in a clockwisedirection, the cushioning fluid will pass readily through the valveopening 27 in the stationary partition and part may pass upwardlythrough the opening; 17A so that aquick movement can be had in thisdirection. When the shaft is turned, however, in the opposite directionor in a counter-clockwise direction` the 'fluid can pass only throughthe small opening 3G in the partition so that the movement in thisdirection will be retarded or will he com.n parativelyoslow. Theparticular form et valve which ll employ permits an exceed'- ingly'quick movement in a clockwise direction, or what is commonly celled aquick return, such as is desired in sometypes of machines.

lt is` to be noted that the shaft, dish l?, partition 24, and movablevane 33 can b e assembled and placed into or removed .from the cylinderas a unit, and therefore the parts can be very easily assembled or takenapart. To adjust the retarded movement the j y cover will be removed andthe screw turned the desired amount to adjust the effective area of theopening 36 and then locked in .the manner described. I

ll do not desire to be confined te the enact details shown anddescribed, but aim in my claims to cover all modifications which do notinvolve a. departure from the spirit and scope of my invention.

`What ll claim as new and desire to secure by Letters Patent is:

1. ln combination, a casing, a partition dividing said casing into twocompartments, said partition being provided with an apar turc, a shaftextending through one com partment and into the second compartment, asleeve in the first compartment through which said shaft extends, acushioning duid and 'a fluid displacing' member in said secondcompartment, and means asscaziated with c litt;

madera said shaft and said sleeve for intercepting fluid that may leal;from said fluid containing compartment and returning saidleakage to thefirst compartment whereby it may pass back to the fluid containingcompartment through said apertured partition.

2. In a dash-pot, a cylinder having a ciom` partment adapted to befilled-with a cushioning fluid, a second compartment, a shaft extendingcentrally through said second compartment and into sai-d firstco1npartment, an apertured partition between said two compartments, astationary partition extending between the shaft and -the wall of thefirst compartment, said stationary partition having a hinged or swingingvalve and a comparatively small opening through which the cushioningfluid may pass when the valve is closed, and a vane secured to saidshaft and extending between the latter and the inner wall of thecylinder.

3. In a dash-pot, a cylinder, a transverse partition .dividing the sameinto two compartments, one above the other, the lower compartment beingadapted to be filled with a cushioning or reta/rding fluid, saidtransverse partition having an opening to permit a'flow of said fluidfrom one compartment to the other compartment, a shaft extendingvertically into said cylinder and through the upper compartment thereof,a substantially radial partition extendingbetween the shaft and theinnerwall of the lower compartment and being provided with avalve andwith a comparatively small opening through which the cushioning fluidmay pass slowly from one side of the partition to the other when thevalve is closed, and a vane secured to the shaft and adapted to be swungback and forth'in said lower compartment, said transverse and radialpartitions, shaft, and vane being removable as a unit from saidcylinder.

4. In a dash-pot, a cylinder having a cover provided with a centrallylocated tubular flange, a disk partition insaid cylinder and dividingthe same into two compartments, one above the other, said disk having anopening which receives the lower end of the tubular flange, said diskhaving another opening to permit the flow ocushioning fluid from onecompartment to another, a shaft extending downwardly through said flangeand disk, a substantially radial partition in the lower compartmentbetween the shaft and the wall of the cylinder, said partition having avalve and valve opening, and having a restricted opening through whichthe cushioning fluid may pass slowly when the valve is closed, and a'movable vane secured to said shaft and engaging the bottom andcylindrical wall of the lower compartment and the lower face of thedisk, said cover, partitions, shaft, and vane being removable as a unitfrom the cylinder.

5. In a dash-pot, a cylinder provided with a cover having a centrallylocated dcpcnding tubular flange, a shaft supported in said flange, adisk in said cylinder dividing thc and with a transverse openingthroughwhich the fluid may pass slowly, and a vane in the lowercompartment secured to the shaft and adapted to be rotated therewith.

6. In a dash-pot, a cylinder provided with a cover having a centrallylocated depending tubular flange, a shaft 'supported in said flange, adisk in said cylinder dividing the latter into two compartments, andhavinga central opening which receives the Alower end of the tubularflange and having a small opening which places the two compartments incommunication with each other, said lower compartment and part of theupper compartment being adapted to contain a cushioning fluid, astationary partition in the lower compartment, said partition having avalve opening and valve and a transverse opening through which the fluidmay pass slowly when the valve is closed, and a vane in the lowercompartment, said vane being secured to the-shaft and adapted' to berotated therewith, said shaft having an annular groove and said tubularflange having an opening which communicates with said groove and permitsthe cushioning fluid, which passes from the lower compartment upwardlyalong the shaft, to flow into the upper compartment.

7. In combination in a dash-pot, a casing adapted to contain acushioning fluid, a. disk within said casing and acting to confine saidfluid, a shaft extending into the casing and through said disk, a vanesecured to the shaft and adapted to be rotated therewith,y a stationarypartition in said casing, said partition having an opening through whichthe cushioning fluid may pass when the shaft is rotated in onedirection, and an adjustable screw passing tl'rrough said disk and intosaid partition, said screw having a transverse opening adapted to bcalined with the opening in said partition.

8. In a dash-pot, a cylinder provided with a transverse partitiondividing the sameY into two compartments, one above the other, saidlower con'ipartment being adapted to he filled with a cushioning fluid,said transverse partition having an opening ywhichv places the wocmpatmezis in cmmunicaf diviing said' casingiimo im@ comparmen's tionwith auch ohci" io peimii; i. owof said one aboye anohei', saidpartition being gi'ou j cushioning Huid from one compartment to vicledwith an aperture, an abutnwut or i anothem a vertical shat extendiiginto he partition and a ffotaabie uid displacing 1 cylinder, said shaif;hai-'ing :i van@ adapted membei' in iii@ lower one of sai compai 1- tobe swung back and forth iii im: ipv/eis ments, said apeitue permiinguniestiicted compartment a Substantially radia paitipassage of fluidtheethiough from ethei oi' tion in h@ iowa? wmp Ont) www sesaidcompartmenis to @he Gthei (me. curing said i'adiai pf Miiwaukee, Viis.,fay 6, 1969; y lo verse pm'titioii? sair'izam" A En testimony Whai'eof iai'rix my a 'valve and :i smaifi opeiiii f ture, in the pi'esfcnc@ oftwo Witneses.

the fluid is mmm u i im 'ign/ 3f v mf. w 1r, w y is tunis@ in. mi direcn? said @spew having LEBER' W LLENM L an opening Whic" coincides WiiiSaid small W'inewSes-z 15 opening iii the iadizii. f iis. L BYRON, 9. ima. flash-psig i )wirf-Litigi@ E. STOLL.

